AD7848 Datasheet

• Complete DAC with DSP Interface, Comprising:
  • - 12-Bit Voltage Mode DAC
  • - 3 V Zener Reference
  • - Output Buffer Amplifier with 4 μs Settling Time
  • - 8 Word FlFO and Interface Logic
• 72 dB Signal-to-Noise Ratio
• Interfaces to High Speed DSP Processors,
• e.g., ADSP-2100,TMS320C25,TMS32010
• 42 ns min WR Pulse Width
• Low Power -60 mW typ

• Digital Signal Processing
• Speech Synthesis
• High Speed Modems
• DSP Servo Control When Used with AD7878

The AD7848 is a fast, complete, 12-bit, voltage output D/A converter with a versatile DSP interface consisting of an 8-word, first-in, first-out (FIFO) memory and associated control logic.

The FIFO memory allows up to eight samples to be loaded to the AD7848 at full microprocessor speed. The samples are then loaded to the DAC register under control of the asynchronous LDAC signal. A fast data setup time of 20ns allows direct interfacing to DSP processors and high speed 16-bit microprocessors.

An on-chip status/control regiser allows the user to program the effective length of the FIFO and contains FIFO empty, FIFO full and FIFO word count information.

The analog output from the AD7848 provides a bipolar output range of ±3V. Full power output signals up to 20 kHz can be created and the AD7848 is fully specified for dynamic performance parameters such as signal-to-noise ratio and harmonic distortion.

The AD7848 is fabricated in Linear Compatible CMOS (LC²MOS), and advanced, mixed technology, process that combines precision bipolar circuits with low power CMOS logic. The part is available in a 28-pin plastic and hermetic dual-in-line package (DIP) and in a 28-terminal plastic leaded chip carrier (PLCC).